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Adding Integers adding machine addition exercises answer window atom Bennington College checkers added checkers that cancel checkers to show checkers to stand checkers will give coin counting number crease Cut a strip Dollars Dollars Dollars drawings below Show Earned Spent edge electrical charge ﬁnal score ﬁnd the integer ﬁrst player folded strip head pointing inches wide integer stands Irving Adler Irving and Ruth John Day keep score larger absolute value means to ﬁnd minus Sign move 2 units moving two units negative integer neutrons nucleus number line number of checkers number of dollars number of units one-step addition opposite picture the integers play positive integer protons Reason Why Books rewards and penalties Ruth Adler second player sets of checkers shown slide card slide rule square strip of cardboard three black checkers three points three red checkers toss total charge total score window cards Winning line write zero